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psm(at)att.net
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 Posted: Tue Jan 04, 2011 1:12 pm Post subject: Tube Bender. |
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I finally got out to my shop and took some pictures of a tube bending jig. It is made mostly from 3/4 inch plywood held together with screws.
It really is easier to bend tubes with this jig than to describe the process. Just fill the tubes with sand, cap them with wood plugs, and bend a little bit at a time. After bending at one point just move the tube a few inches and bend that point. If it is bent too far spin it 180 degrees and un-bend a little.
Good luck,
Paul
[img]cid:part1.02030909.04060003(at)att.net[/img]
On 1/4/2011 12:09 PM, Scotsman wrote: | Quote: | | Quote: | --> Zenith-List message posted by: "Scotsman" <jaroberts(at)bdo.co.za> (jaroberts(at)bdo.co.za)
Hi Paul,
I can't bend the hoops as I have already drilled a number of holes it them and according to several of the guys bending hoops with holes equals broken hoops (see the Zenith Aero posts on the same subject). [Crying or Very sad]
--------
Cell +27 83 675 0815
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=325581#325581
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carlossa52(at)gmail.com
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| Posted: Tue Jan 04, 2011 2:04 pm Post subject: Tube Bender. |
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Very nice, Paul - this one's a keeper!
Happy 2011
Carlos
do not archive
On 4 January 2011 16:08, Paul Mulwitz <psm(at)att.net (psm(at)att.net)> wrote:
[quote] I finally got out to my shop and took some pictures of a tube bending jig. It is made mostly from 3/4 inch plywood held together with screws.
It really is easier to bend tubes with this jig than to describe the process. Just fill the tubes with sand, cap them with wood plugs, and bend a little bit at a time. After bending at one point just move the tube a few inches and bend that point. If it is bent too far spin it 180 degrees and un-bend a little.
Good luck,
Paul
[b]
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flyadive(at)gmail.com
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| Posted: Tue Jan 04, 2011 3:23 pm Post subject: Tube Bender. |
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Paul:
LQQKing at your gig it does not look like it has a grove on the radius part - Good and bad, but really not needed. To prevent the tube from twisting or rolling off the gig clamp another piece of ply to make a sandwich. Works great and if there is too much friction with the tube just add a shim.
Barry
On Tue, Jan 4, 2011 at 4:08 PM, Paul Mulwitz <psm(at)att.net (psm(at)att.net)> wrote:
[quote] I finally got out to my shop and took some pictures of a tube bending jig. It is made mostly from 3/4 inch plywood held together with screws.
It really is easier to bend tubes with this jig than to describe the process. Just fill the tubes with sand, cap them with wood plugs, and bend a little bit at a time. After bending at one point just move the tube a few inches and bend that point. If it is bent too far spin it 180 degrees and un-bend a little.
Good luck,
Paul
[img]?ui=2&ik=4903844248&view=att&th=12d52e2a32c570d6&attid=0.1.1&disp=emb&zw[/img]
On 1/4/2011 12:09 PM, Scotsman wrote: | Quote: | | Quote: | --> Zenith-List message posted by: "Scotsman" <jaroberts(at)bdo.co.za> (jaroberts(at)bdo.co.za)
Hi Paul,
I can't bend the hoops as I have already drilled a number of holes it them and according to several of the guys bending hoops with holes equals broken hoops (see the Zenith Aero posts on the same subject). [Crying or Very sad]
--------
Cell +27 83 675 0815
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=325581#325581
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[b]
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psm(at)att.net
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| Posted: Tue Jan 04, 2011 3:31 pm Post subject: Tube Bender. |
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Hi Barry,
Yes, you are right. There is no groove on my jig.
I have not had any problem with tubes wanting to twist while bending. I also haven't noticed any large amount of flattening of the tube. I guess it is all about bending a little bit at a time.
Paul
On 1/4/2011 3:20 PM, FLYaDIVE wrote: [quote]Paul:
LQQKing at your gig it does not look like it has a grove on the radius part - Good and bad, but really not needed. To prevent the tube from twisting or rolling off the gig clamp another piece of ply to make a sandwich. Works great and if there is too much friction with the tube just add a shim.
Barry
On Tue, Jan 4, 2011 at 4:08 PM, Paul Mulwitz <psm(at)att.net (psm(at)att.net)> wrote:
| Quote: | I finally got out to my shop and took some pictures of a tube bending jig. It is made mostly from 3/4 inch plywood held together with screws.
It really is easier to bend tubes with this jig than to describe the process. Just fill the tubes with sand, cap them with wood plugs, and bend a little bit at a time. After bending at one point just move the tube a few inches and bend that point. If it is bent too far spin it 180 degrees and un-bend a little.
Good luck,
Paul
[img]?ui=2&ik=4903844248&view=att&th=12d52e2a32c570d6&attid=0.1.1&disp=emb&zw[/img]
On 1/4/2011 12:09 PM, Scotsman wrote: | Quote: | | Quote: | --> Zenith-List message posted by: "Scotsman" <jaroberts(at)bdo.co.za> (jaroberts(at)bdo.co.za)
Hi Paul,
I can't bend the hoops as I have already drilled a number of holes it them and according to several of the guys bending hoops with holes equals broken hoops (see the Zenith Aero posts on the same subject). [Crying or Very sad]
--------
Cell +27 83 675 0815
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=325581#325581
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[b]
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Scotsman
Joined: 27 Aug 2007
Posts: 89
Location: Johannesburg, South Africa
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| Posted: Wed Jan 12, 2011 8:51 pm Post subject: Re: Tube Bender. |
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Paul you are a star..I set up your jig a la the photo earlier on the thread and it worked really well. Like you mentioned earlier it is an iterative process (slowly slowly) but the result on the front hoop is that it is a pretty exact match to the shape of the canopy.
On the subject of the groove mentioned earlier it is not necessary. I also found that the 19mm shutter ply dented in after several bends to form a small gentle bend that maybe helped.
If I had to repeat this exercise I would probably bolt both elements to the jog instead of using screws as the screws seemed to provide a little "give" which does really help the process.
PS. I didn't notice any flattening of the hoop and I did not fill the hoop with sand (which I probably should have done).
James
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psm(at)att.net
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| Posted: Wed Jan 12, 2011 9:23 pm Post subject: Tube Bender. |
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Thank you James,
That is the first nice thing anybody on this list has said to me in years.
Best regards,
Paul
On 1/12/2011 8:51 PM, Scotsman wrote:
| Quote: |
Paul you are a star..I set up your jig a la the photo earlier on the thread and it worked really well. Like you mentioned earlier it is an iterative process (slowly slowly) but the result on the front hoop is that it is a pretty exact match to the shape of the canopy.
On the subject of the groove mentioned earlier it is not necessary. I also found that the 19mm shutter ply dented in after several bends to form a small gentle bend that maybe helped.
If I had to repeat this exercise I would probably bolt both elements to the jog instead of using screws as the screws seemed to provide a little "give" which does really help the process.
PS. I didn't notice any flattening of the hoop and I did not fill the hoop with sand (which I probably should have done).
James
--------
Cell +27 83 675 0815
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=326813#326813
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Scotsman
Joined: 27 Aug 2007
Posts: 89
Location: Johannesburg, South Africa
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